Compilation error occurred while building

Yang :
module siltest3 {

namespace "http://netconfcentral.org/ns/siltest3";
prefix "siltest3";

description
"Test SIL code generation for nested lists and union types.";

revision 2011-09-16

{ description "Initial version."; }

list u {
key ux;
leaf ux {
type union

{ type uint32; type string; }

}
leaf uy

{ type uint32; }
leaf uz { config false; type uint32; }
leaf uu {
config false;
type union { type int32; type uint8; }
}
}

list c {
key x;
leaf x { type uint16; }
leaf z { type uint64; config false; }
leaf cuu {
type union { type int32; type uint8; type string; }
}
list cc {
key "xx1 xx2 xx3 xx4 xx5 xx6 xx7 xx8 xx9";
leaf xx1 {
type union { type uint32; type string; }
}
leaf xx2 { type int8; }
leaf xx3 { type int16; }
leaf xx4 { type int32; }
leaf xx5 { type int64; }
leaf xx6 { type uint8; }
leaf xx7 { type uint16; }
leaf xx8 { type uint32; }

leaf xx9

{ type uint64; }

leaf yy

{ type int32; }

leaf zz

{ type uint64; config false; }
list ccc {
key xxx;
leaf xxx { type string; }
leaf yyy { type boolean; }
leaf zzz { type uint64; config false; }

}
}
}

rpc r {
input {
leaf a

{ type string; }

leaf b

{ type int8; }

}
output {
leaf c

{ type int64; }
}
}

notification n {
leaf a { type binary; }
leaf c { type int64; }

}
}

Build Logs :
mvn clean install
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building onlab-test 1.6.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] — maven-clean-plugin:2.5:clean (default-clean) @ onlab-test —
[INFO] Deleting /opt/onos-master/onos/utils/test/target
[INFO]
[INFO] — jacoco-maven-plugin:0.7.5.201505241946:prepare-agent (default-prepare-agent) @ onlab-test —
[INFO] argLine set to -javaagent:/home/root1/.m2/repository/org/jacoco/org.jacoco.agent/0.7.5.201505241946/org.jacoco.agent-0.7.5.201505241946-runtime.jar=destfile=/opt/onos-master/onos/utils/test/target/jacoco.exec -Duser.language=en -Duser.region=US
[INFO]
[INFO] — yangutils-maven-plugin:1.0.0-SNAPSHOT:yang2java (default) @ onlab-test —
[INFO] Source directory added to compilation root: /opt/onos-master/onos/utils/test/src/main/java
[INFO]
[INFO] — maven-resources-plugin:2.7:resources (default-resources) @ onlab-test —
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /opt/onos-master/onos/utils/test/src/main/resources
[INFO] Copying 1 resource
[INFO]
[INFO] — maven-compiler-plugin:2.5.1:compile (default-compile) @ onlab-test —
[INFO] Compiling 27 source files to /opt/onos-master/onos/utils/test/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[26,91] error: cannot find symbol
[ERROR] symbol: class Rinput
location: package org.onosproject.yang.gen.v1.http.netconfcentral.org.ns.siltest3.rev20110916.siltest3
/opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[22,91] error: cannot find symbol
[ERROR] symbol: class Rinput
location: package org.onosproject.yang.gen.v1.http.netconfcentral.org.ns.siltest3.rev20110916.siltest3
/opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[81,18] error: cannot find symbol
[ERROR] symbol: class Rinput
location: class Siltest3Manager
/opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[67,11] error: cannot find symbol
[INFO] 4 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.058 s
[INFO] Finished at: 2016-06-01T16:59:54+05:30
[INFO] Final Memory: 32M/373M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project onlab-test: Compilation failure: Compilation failure:
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[26,91] error: cannot find symbol
[ERROR] symbol: class Rinput
[ERROR] location: package org.onosproject.yang.gen.v1.http.netconfcentral.org.ns.siltest3.rev20110916.siltest3
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[22,91] error: cannot find symbol
[ERROR] symbol: class Rinput
[ERROR] location: package org.onosproject.yang.gen.v1.http.netconfcentral.org.ns.siltest3.rev20110916.siltest3
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[81,18] error: cannot find symbol
[ERROR] symbol: class Rinput
[ERROR] location: class Siltest3Manager
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[67,11] error: cannot find symbol
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
root1@root1-HP-EliteBook-840-G2:/opt/onos-master/onos/utils/test$